SC4539: High Efficiency Boost Converter For Up To 6 LEDS | Semtech

The SC4539 is designed to regulate current for a series chain of white LEDs in LCD backlighting applications where small size and high ei ciency are priorities. This device integrates an 800kHz current-mode PWM boost converter and a 30mA programmable low dropout current sink Regulator An external resistor sets the LED current up to 30mA. PWM dimming (100Hz to 50kHz) may be applied directly to the enable (EN) pin, or dimming CAN be controlled by applying an Analog signal to the ISET circuit. The boost circuit CAN output up to 22V (guaranteed) to drive up to 6 LEDs in series. The current Regulator protects against shorts between the BL and OUT pins and also eliminates backlight glow during shutdown when using LEDs with high leakage. Under-voltage lockout and thermal shut- down provide additional protection. A small external capacitor and series resistor control soft-start and loop compensation. Over-voltage detection protects the SC4539 if the LED pin is l oating or shorted to ground. By Semtech Corporation
SC4539 's PackagesSC4539 's pdf datasheet

SC4539 Pinout, Pinouts
SC4539 pinout,Pin out
This is one package pinout of SC4539,If you need more pinouts please download SC4539's pdf datasheet.

SC4539 Application circuits
SC4539 circuits
This is one application circuit of SC4539,If you need more circuits,please download SC4539's pdf datasheet.

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